CVE-2026-49332
HIGH 8.5A flaw was found in openshift/oauth-proxy. The proxy sets authenticated identity headers using only dash-variant keys (X-Forwarded-User) but does not strip underscore-variant keys (X_Forwarded_User) from incoming requests. WSGI and PHP frameworks normalize both variants to the same variable, allowing an authenticated low-privilege user to smuggle a forged identity that may override the legitimate authenticated identity in the upstream application.
Severe if exploited (CVSS 8.5), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 22nd percentile
Impact if exploited
8.5CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityLow
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ⚠Privileges: Requires a low-privilege account
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-49332/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-49332/poc.json
Affected
Vendors Red Hat
Products Red Hat Openshift Container Platform 4.12 Red Hat Openshift Container Platform 4.13 Red Hat Openshift Container Platform 4.14 Red Hat Openshift Container Platform 4.16 Red Hat Openshift Container Platform 4.18 Red Hat Openshift Container Platform 4.19 Red Hat Openshift Container Platform 4.20 Red Hat Openshift Container Platform 4.21 Red Hat Openshift Container Platform 4.22
Weakness (CWE)
- CWE-436: Interpretation Conflict
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
All CVSS metrics
- HIGH 8.5 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N - HIGH 8.5 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
References
Advisories
- https://access.redhat.com/errata/RHSA-2026:50681
- https://access.redhat.com/errata/RHSA-2026:50758
- https://access.redhat.com/errata/RHSA-2026:51007
- https://access.redhat.com/errata/RHSA-2026:51013
- https://access.redhat.com/errata/RHSA-2026:51022
- https://access.redhat.com/errata/RHSA-2026:51025
- https://access.redhat.com/errata/RHSA-2026:51038
- https://access.redhat.com/errata/RHSA-2026:54188
- https://access.redhat.com/errata/RHSA-2026:54206